Update GitHub Actions and warm perf caches

[kostyafarber]

Summary

• upgrade GitHub, pnpm, and path-filter actions to their Node 24 releases
• remove the redundant setup-node pnpm-store cache while retaining the existing node_modules cache
• save macOS node modules, Playwright browsers, and native binaries immediately after they are produced so failing GPU tests do not prevent cache warming
• clean closed-PR caches using their actual refs/pull/<number>/merge scope and remove the unnecessary checkout

Validation

• go run github.com/rhysd/actionlint/cmd/actionlint@v1.7.12 .github/workflows/ci.yml .github/workflows/perf.yml .github/workflows/pr-clean-caches.yml
• pnpm format:files --check .github/workflows/ci.yml .github/workflows/perf.yml .github/workflows/pr-clean-caches.yml
• dry-ran the cleanup lookup against merged PR feat: add resident Slug glyph catalog #163; it correctly found and parsed seven pull-ref caches without deleting them